uploadFile = new File(getServletContext().getRealPath("/css/" + fileName));
        } else if (checkFileType(fileName, fessConfig.getSupportedUploadedJsExtentionsAsArray())
                && checkFileType(uploadedFileName, fessConfig.getSupportedUploadedJsExtentionsAsArray())) {
            uploadFile = new File(getServletContext().getRealPath("/js/" + fileName));

    }

    String getSupportedUploadedJsExtentions();

    default String[] getSupportedUploadedJsExtentionsAsArray() {
        return split(getSupportedUploadedJsExtentions(), ",")
                .get(stream -> stream.filter(StringUtil::isNotBlank).toArray(n -> new String[n]));
    }